Migrate to Terraform Plugin SDK

[dikhan]

Is your feature request related to a problem?

Looks like the plugin sdk has been extracted out from terraform core to its own library and the terraform folks are suggesting people to migrate. Will create a card on the board for this.

https://twitter.com/mitchellh/status/1176969121948405764?s=12

Describe the solution you'd like

Terraform Plugin SDK - Terraform by HashiCorp

https://www.terraform.io/docs/extend/plugin-sdk.html

Acceptance criteria

• All the imports containing "github.com/hashicorp/terraform" should be pointing at "github.com/hashicorp/terraform-plugin-sdk"
• Go module github.com/hashicorp/terraform, known as Terraform Core, should switch to github.com/hashicorp/terraform-plugin-sdk, the Terraform Plugin SDK, instead.
• Unit test pass after the migration
• Integration tests pass after the integration

Describe alternatives you've considered

A clear and concise description of any alternative solutions or features you've considered.

Additional context

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Checklist

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